That was what was so "groundbreaking" about that litigation - and why it was probably wrongly decided.
Before that decision, a patent for a "concept" was not a valid patent. The trial judge made new law by declaring valid what all previous decisions would have declared invalid.
Kodak had the information and wherewithal to use methods and procedures that differed greatly from the approach taken by Polaroid. Normally, if you use very different methods to obtain a similar but not identical result, you won't be in breach of a patent.
Interestingly, Kodak's breach was found not to be willful. So they weren't exposed to increased damages.
The trial was long, but most of it was over the issue of measure of damages. Polaroid sought $12 billion. Kodak was mostly successful on that part. Their "profits" were measured at about $900 million, and therefore that was the amount they were ordered to pay.
By the time that the litigation ended, the instant camera and integral film market was dropping, due to the combination of the explosion of 35mm film use and one hour labs.